I have searched and didn't find my problem, so I am looking for your help.

I have an 88 Iroc (LO3).

I bought a TBI rebuild kit from CFM Tech a while ago. Today I finally got around to doing the rebuild. I thought it came apart and went together very easily. I also ground down the "wall section" around the inlets. That came out very well and everything is smooth. When I was done grinding I used my air compressor to blow it out and then used brake cleaner.

Got everything put back in my car and it will surge (900-500 rpms) a few times and then die. The fuel pressure is 9 psi.

Everything worked fine when I took it apart. She ran like a champ.

Thanks in advance for any and all help!!!!

 

Only having 9 psi is your problem. Did you replace the FPR spring or diaphram(sp)? You should have 12 or 13 psi for the L03 if I am correct.

 

yes, I replaced all of the seals, o-rings, gaskets and diaphram. I will double check the fuel pressure.

Thanks

 

lean surge is the first thing that came to mind. Watch out when it runs too lean she gets pretty hot in those cylinders.

 

I would double check that the diaphram is correctly installed. I have heard if the diaphram is installed upside down it will cause similar problems.

 

Thanks for all of the tips.

I double checked my fuel pressure guage (installed in line, in the rubber hose section that is between the hard lines on the wheel well), and it is reading 9 psi. I installed the diaphram with the cup side towards the spring.

When I disconnect the vac. line that runs to the MAP sensor, it will idle constant but high (1100 rpms). I bought a new MAP sensor, when I plugged it in, I still had surging. Trouble guessing at this point.

From what I've been reading, I think my IAC is bad. Got a new one coming soon.

Thanks again for all of the help